Method for extracting lactose powder from milk whey

Abstract

The invention discloses a method for extracting lactose powder from milk whey. The method comprises steps as follows: step 1), fresh milk is subjected to first centrifugation, and skim milk is obtained; step 2), the milk is subjected to second centrifugation, and whey is obtained; the whey passes through a first ultrafiltration membrane under second pressure, and first permeate after the whey passes through the first ultrafiltration membrane is obtained; step 3), an acetate-sodium acetate solution is added to the first permeate; step 4), second permeate is dropwise added to 0.1wt%-5wt% of a sodium hydroxide solution, a mixed solution obtained after 15 min is subjected to filter pressing by a plate-and-frame filter press, first retentate is obtained on a filter screen and is dissolved in 0.08wt%-1.6wt% of a hydrochloric acid solution, a mixed solution obtained after 2 h passes through a nanofiltration membrane under third pressure, and fourth permeate is obtained; step 5), the fourth permeate is subjected to spray drying, and the lactose powder is obtained. With the adoption of the method, the technical problems that the lactose is difficult to extract and the extraction purity is not high are solved.

Description

technical field [0001] The invention belongs to the technical field of dairy product production, in particular to a method for extracting lactose powder from milk whey. Background technique [0002] Whey products belong to the category of dairy products and are by-products of cheese production. About 1 kg of cheese can be produced with 10 kg of fresh milk, and the rest is whey. Fresh whey has about 7% dry matter but contains nearly half the nutrients of fresh milk. In the production process of cheese, most of the fat of milk and casein, which accounts for 80% of the total protein, form the basic framework of cheese curd, while whey is a component other than cheese curd. Most of the nutrients contained in whey are soluble, such as whey protein. Phospholipids, Lactose. minerals and vitamins etc. [0003] Fresh whey is pasteurized and then dried into powder, which is whey powder. The ratio of other ingredients in whey powder except water should be consistent with that of f...

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned technical problems, the present invention proposes a method for extracting lactose powder from milk whey, extracting whey by centrifugation twice, then performing microfiltration, ultrafiltration for the first time, and nanofiltration after ultrafiltration for the second time. Filter to obtain pure lactose solution, and after spray drying, lactose powder can be obtained, which solves the technical problems that lactose is not easy to extract and the extraction purity is not high

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